Supply Drop (Not sure if spelled right)

When I saw the supply drop in season 2 I was thinking like most people "Where in the world did this come from." I spent alot of time searching for possible answer but came up with nothing. By the time season 5 ended I had completely forgoten about the drop. With season 6 coming up I now am hoping to see the reason of the supply drop. Does anyone have any good theories?

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